Yo-kai and general RNG

[Bixillarla]

what is the actual purpose of these weapons anyways? I acquired the knives but i have yet to see the real use of them?
Can we come up with a real solution to useless weapons and gear?

Glamour and if you get all the weapons you get a 2nd mount. Some like collecting seasonal items and achievements, some people like collecting mounts, some people do it for fun, etc.